linux-kernel - Re: [PATCH] irqchip/mips-gic: Fix IRQs in gic_dev

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Date:	Thu, 23 Jun 2016 18:11:17 +0000
From:	Jason Cooper <jason@...edaemon.net>
To:	Qais Yousef <qsyousef@...il.com>, g@...lakedaemon.net
Cc:	Harvey Hunt <harvey.hunt@...tec.com>, linux-mips@...ux-mips.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, marc.zyngier@....com
Subject: Re: [PATCH] irqchip/mips-gic: Fix IRQs in gic_dev_domain

Qais,

On Tue, May 24, 2016 at 11:43:07AM +0100, Qais Yousef wrote:
> Hmm I certainly did test this on real hardware with GIC. Are you using the
> new dev domain? The idea is that GIC is logically divided and shouldn't be
> used directly. Sorry I'm travelling and can't check the code.

Any update on this patch?  Should I stop tracking it?

thx,

Jason.

> On 23 May 2016 12:06, "Harvey Hunt" <harvey.hunt@...tec.com> wrote:
> 
> > When allocating a new device IRQ, gic_dev_domain_alloc() correctly calls
> > irq_domain_set_hwirq_and_chip(), but gic_irq_domain_alloc() does not. This
> > means that gic_irq_domain believes all IRQs from the dev domain have an
> > hwirq of 0 and creates incorrect mappings in the linear_revmap. As
> > gic_irq_domain is a parent of the gic_dev_domain, this leads to an
> > inability to boot on devices with a GIC. Excerpt of the error:
> >
> > [    2.297649] irq 0: nobody cared (try booting with the "irqpoll" option)
> > ...
> > [    2.436963] handlers:
> > [    2.439492] Disabling IRQ #0
> >
> > Fix this by calling irq_domain_set_hwirq_and_chip() for both the dev and
> > irq domain.
> >
> > Now that we are modifying the parent domain, be sure to clear it up in
> > case of an allocation error.
> >
> > Fixes: c98c1822ee13 ("irqchip/mips-gic: Add device hierarchy domain")
> > Fixes: 2af70a962070 ("irqchip/mips-gic: Add a IPI hierarchy domain")
> > Signed-off-by: Harvey Hunt <harvey.hunt@...tec.com>
> > Tested-by: Govindraj Raja <Govindraj.Raja@...tec.com> # On Pistachio SoC
> > Reviewed-by: Matt Redfearn <matt.redfearn@...tec.com>
> > Cc: <linux-mips@...ux-mips.org>
> > Cc: <linux-kernel@...r.kernel.org>
> > Cc: Qais Yousef <qsyousef@...il.com>
> > ---
> >  drivers/irqchip/irq-mips-gic.c | 12 +++++++++++-
> >  1 file changed, 11 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/irqchip/irq-mips-gic.c
> > b/drivers/irqchip/irq-mips-gic.c
> > index 4dffccf..40fb120 100644
> > --- a/drivers/irqchip/irq-mips-gic.c
> > +++ b/drivers/irqchip/irq-mips-gic.c
> > @@ -734,6 +734,12 @@ static int gic_irq_domain_alloc(struct irq_domain *d,
> > unsigned int virq,
> >                 /* verify that it doesn't conflict with an IPI irq */
> >                 if (test_bit(spec->hwirq, ipi_resrv))
> >                         return -EBUSY;
> > +
> > +               hwirq = GIC_SHARED_TO_HWIRQ(spec->hwirq);
> > +
> > +               return irq_domain_set_hwirq_and_chip(d, virq, hwirq,
> > +
> > &gic_level_irq_controller,
> > +                                                    NULL);
> >         } else {
> >                 base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs);
> >                 if (base_hwirq == gic_shared_intrs) {
> > @@ -855,10 +861,14 @@ static int gic_dev_domain_alloc(struct irq_domain
> > *d, unsigned int virq,
> >
> > &gic_level_irq_controller,
> >                                                     NULL);
> >                 if (ret)
> > -                       return ret;
> > +                       goto error;
> >         }
> >
> >         return 0;
> > +
> > +error:
> > +       irq_domain_free_irqs_parent(d, virq, nr_irqs);
> > +       return ret;
> >  }
> >
> >  void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
> > --
> > 2.8.2
> >
> >